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Finding the Fourth Proportional to 1,359.47, 2,039.16 and 385.58

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Solution

The fourth proportional to 1,359.47, 2,039.16 and 385.58 is: 578.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,359.47 : 2,039.16 = 385.58 : x
  2. Step 2: Convert to fraction form
    1,359.47/2,039.16 = 385.58/x
  3. Step 3: Cross multiply
    1,359.47x = 2,039.16 × 385.58
  4. Step 4: Simplify right side
    1,359.47x = 786,264.41
  5. Step 5: Solve for x
    x = 786,264.41/1,359.47
  6. Step 6: Final answer
    x = 578.36

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.